Manza Onsen Hokokukan

The star here is a large mixed open-air bath (konyoku rotenburo, 混浴露天風呂) filled with milky bluish-white sulfur water, high up in the Manza Onsen area. The spring flows in unfiltered and the colour and texture of the water draw people back repeatedly. A separate women-only open-air bath is also available. The inn is simple and a little dated, but the water is the whole point.